矿产资源压覆情况证明 certification of mineral resources coverage

覆验证明书 revalidation certificate

覆盖驱动验证 Coverage-driven Verification

基于覆盖率的验证 Coverage-Driven Verification

覆核加租证明书 review of a rent increase certificate

塑料真空镀覆质量保证 Vacuum coating quality assurance

覆检评估证明书 Certificate of Review of Assessment